What is the Von Restorff effect in UX design?
The Von Restorff effect, also known as the isolation effect, was identified by psychiatrist Hedwig von Restorff in 1933. It states that when multiple similar items are present, the one that is most different from the rest is most likely to be remembered. In UX design, this principle is applied to direct user attention to the most important elements on a screen by making them visually distinct from their surroundings.
How does the Von Restorff effect apply to interface design?
A primary call-to-action button that uses a high-contrast color while secondary buttons use muted or outline styles applies the Von Restorff effect to direct users toward the most important action. A highlighted pricing tier in a pricing table that uses a distinctive visual treatment to indicate the recommended option applies the same principle. A notification badge on an icon that stands out from the icon itself uses the Von Restorff effect to draw attention to new information.
What is the relationship between the Von Restorff effect and visual hierarchy?
The Von Restorff effect is one of the mechanisms through which visual hierarchy works. Visual hierarchy is the system of visual relationships that communicates relative importance. The Von Restorff effect explains why making the most important element different from everything around it is more effective at directing attention than simply making it larger. Distinctiveness drives attention and memory more reliably than size alone.
How to apply the Von Restorff effect without creating visual noise?
The Von Restorff effect only works when distinctiveness is used sparingly. If every element on a screen is visually distinctive, none of them stands out and the effect is lost. The principle requires restraint: reserve visual distinctiveness for genuinely important elements and maintain visual uniformity for everything else. This is why button hierarchy guidelines recommend using only one primary button per view and ensuring secondary buttons are visually subordinate.